Laser action on a single spatially chaotic wave function is obtained as a final stable state in a nonlinear dynamical model of a stadium shaped resonant cavity with an active medium. The stable single-mode lasing state corresponds to a particular metastable resonance of the cavity which wins a competition among multiple modes with positive net linear gain and has a distinct lasing threshold.

We show how to construct symbolic dynamics for the class of 2d-dimensional twist mappings generated by piecewise strictly convex/concave generating functions. The method is constructive and gives an eecient way to nd all periodic orbits of these high dimensional symplectic mappings. It is illustrated with the cardioid and the stadium billiard.

6 Gases 19 6.1 The Dilute Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.2 The Ideal Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.3 The Kac Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.4 Gas of Noninteracting Particles in a Stadium-Box . . . . . . . . . . . 25 6.5 Gas of Noninteracting Particles in a Mushroom-Box . . . . ...

In this poster we outline our framework for the analysis of crowds in different settings (city centres, sports events, etc.) and situations (regular or extreme). The framework has a monitor, a model and an intervene component to evaluate a number of strategies for risk and damage mitigation measures. This is illustrated with an example of a crowd at a football stadium.

Nadeem ur Rehman MBBS Faran Emmanuel MBBSMSc Saeed Akhtar PhD Country Office for Pakistan, UNODC; Department of Community Health Sciences, Aga Khan University, Stadium Road, Karachi, Pakistan; Epidemiology, Department of Community Medicine and Behavioural Sciences, Faculty of Medicine, Kuwait University, PO Box 24923, Safat 13110, Kuwait Correspondence to: Saeed Akhtar Email: [email protected]...

The last stadium larva of Microgomphus thailandica is described, illustrated and compared with the larvae of congeneric species based on reared specimens collected from the Phachi headwater stream, Ratchaburi province, Thailand. The female adult of this species is described for the first time from a reared specimen from the same locality.

J. Melosh B. C. Johnson and T. J. Bowling, Earth Atmospheric and Planetary Sciences Department, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907 USA ([email protected]), Department of Earth, Environmental, and Planetary Sciences, Brown University, 324 Brook Street, Providence, RI 02912, USA. Department of the Geophysical Sciences, University of Chicago, 5734 S. Ellis Avenue,...

We review known results and derive some new ones about the mean free path, Kolmogorov-Sinai entropy and Lyapunov exponents for billiard type dynamical systems. We focus on exact and asymptotic formulas for these quantities. The dynamical systems covered in the paper include periodic Lorentz gas, stadium and its modifications, and the gas of hard balls. Some open questions and numerical observat...

OF Assessment of a stochastic interpolation based parameter sampling scheme for efficient uncertainty analyses of hydrologic models Faisal Hossain , Emmanouil N. Anagnostou Department of Civil and Environmental Engineering, Tennessee Technological University, Box 5015, 1020 Stadium Drive, Cookeville, TN 38505-0001, USA Received 11 July 2004; received in revised form 10 October 2004; accepted 5 ...

Numerical calculations studying bound eigenstates in chaotic regions of phase space, including those of the stadium billiard, are summarized. These calculations demonstrate that the scars of periodic orbit model is seriously flawed. An alternative picture of localization in chaotic regions is outlined.